Although Open Space Technology is powerful and effective, never use it for the sake of the process alone, only for the potential results. OST is designed to do a job, to work a real business issue, no matter how you define "business" or "Issue." So a first act of preparation is to determine in concrete terms what you want to accomplish, best stated in a question…It must focus on a real…issue that is of passionate concern to those who will be involved.

-- Harrison Owen, originator of Open Space Technology
Excerpted from his book, "Open Space Technology: A User's Guide"
-- Berrett-Koehler, publishers, San Francisco.
This book can be ordered for a slight discount off the retail price through the Open Space Institute of the US.
Contact them at: http://www.openspaceworld.org/wiki/wiki/wiki.cgi?BooksAndVideos

Here are some examples of themes from some of my past Open Space events:

YouthBuild, USA Academy for Transformation's Diversity Leadership workshop, "Healing and Dealing"

The Practice of Peace - San Francisco gathering - Day 1 Theme